如何使底部导航显示带有图标和文本的菜单项除了中心项目菜单只显示图标？

Question

我想创建底部导航栏显示菜单项图标和文本，中心项除外。例如。我有附加图像

Answer 1

尝试以下代码：

XML文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="top"
        android:background="@color/gray"
        android:foregroundGravity="top"
        android:gravity="top">

    </android.support.v7.widget.Toolbar>

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1">


        <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/fragment_container"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

    </FrameLayout>


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <android.support.design.widget.BottomNavigationView
            android:id="@+id/bottomnav"
            android:layout_width="0dp"
            android:layout_height="56dp"
            android:layout_weight="1"
            android:background="null"
            app:itemIconTint="@color/green"
            app:itemTextColor="@color/green"
            app:menu="@menu/main">


        </android.support.design.widget.BottomNavigationView>

        <ImageView
            android:layout_width="0dp"
            android:layout_height="56dp"
            android:layout_weight="0.5"
            android:src="@drawable/camera" />

        <android.support.design.widget.BottomNavigationView
            android:id="@+id/bottomnav1"
            android:layout_width="0dp"
            android:layout_height="56dp"
            android:layout_weight="1"
            android:background="null"
            app:itemIconTint="@color/green"
            app:itemTextColor="@color/green"
            app:menu="@menu/main">


        </android.support.design.widget.BottomNavigationView>
    </LinearLayout>
</LinearLayout>

助手类：

public class BottomNavigationViewHelper {
    public static void disableShiftMode(BottomNavigationView view) {
        BottomNavigationMenuView menuView = (BottomNavigationMenuView) view.getChildAt(0);
        try {
            Field shiftingMode = menuView.getClass().getDeclaredField("mShiftingMode");
            shiftingMode.setAccessible(true);
            shiftingMode.setBoolean(menuView, false);
            shiftingMode.setAccessible(false);
            for (int i = 0; i < menuView.getChildCount(); i++) {
                BottomNavigationItemView item = (BottomNavigationItemView) menuView.getChildAt(i);
                //noinspection RestrictedApi
                item.setShiftingMode(false);
                // set once again checked value, so view will be updated
                //noinspection RestrictedApi
                item.setChecked(item.getItemData().isChecked());
            }
        } catch (NoSuchFieldException e) {
            Log.e("BNVHelper", "Unable to get shift mode field", e);
        } catch (IllegalAccessException e) {
            Log.e("BNVHelper", "Unable to change value of shift mode", e);
        }
    }
}

活动：

BottomNavigationView bnav = (BottomNavigationView) findViewById(R.id.bottomnav);
BottomNavigationViewHelper.disableShiftMode(bnav);

菜单文件：

<item
    android:id="@+id/place"
    android:icon="@drawable/ic_place_black_24dp"
    android:title="Place"/>

<item
    android:id="@+id/home"
    android:icon="@drawable/ic_account_balance_black_24dp"
    android:title="Home"/>